Netskope Global Technical Success (GTS)

Blocking Emails Destined to Personal Email Accounts

Netskope Cloud Version - 129

Objective

Block emails addressed to personal email domains such as *@gmail.com, *@yahoo.com, and *@outlook.com.

Prerequisite

Netskope SWG or Next-Gen SWG license is required

Context

The customer may have a use case where they want to prevent end-users from sending or forwarding emails to their personal email addresses.

Do You Know?

• As of Aug 25, 2025, Netskope recognizes 277 cloud applications categorized under ‘Webmail’

• Netskope engines are capable of detecting the sender and recipient when an end-user sends an email

Sender - From User

Recipient - To User

Configuration

In the below example, I am considering Google Gmail is my official webmail platforms

• Step 1 - Create a Constraint profile

Path - Netskope Tenant UI >>> Policies >>> Profiles - - - Constraints

Note

• If the business objective is to block all email addresses on Gmail domains, use the pattern: *@gmail.com.

• If the objective is to block specific email addresses on Gmail, specify the full email ID, e.g., adam@gmail.com or manish@gmail.com.

• Step 2 - Real-time protection policy

Path - Netskope Tenant UI >>> Policies >>> Real-time Protection >>> New Policy

Verification

For testing purposes, I attempted to send an email to my personal Gmail ID.

Terms and Conditions

• All documented information undergoes testing and verification to ensure accuracy.
• In the future, it is possible that the application's functionality may be altered by the vendor. If any such changes are brought to our attention, we will promptly update the documentation to reflect them.

Notes

• This article is authored by Netskope Global Technical Success (GTS).
• For any further inquiries related to this article, please contact Netskope GTS by submitting a support case with 'Case Type – How To Questions'.